1042 LIST OF HOMOPTEEOUS INSECTS. 



as the fifth ; seventh a little longer than the sixth : front convex in 

 the middle with a slight tubercle on each side : eyes dark piceous, 

 prominent : legs slender, raiher short ; fore-legs but little shorter 

 than the hind legs ; shanks straight : nectaries less than one-twen- 

 tieth of the length of the body. On the Birch. Length f line. 



England. 



315. Aphis impingens. 



Flava, depressa, subovata ; antenrKe corporis quadranle breviores ; 

 cornicula nulla ; pedes breves^ validi. 



The viviparous wingless female. Body yellow, rather flat, in- 

 creasing in breadth from the head till near the tip of the abdomen : 

 head forming a half circle, rounded in front : eyes piceous, on the 

 top of the head, not on the sides as is usual : feelers not one-fourth 

 of the length of the body; first and second joints short; fourth 

 much shorter than the third ; fifth and sixth of moderate length ; 

 seventh very short : mouth not reaching much beyond the fore-hips ; 

 fore-chest moderately large ; sides convex ; nectaries not rising 

 above the surface of the abdomen: legs short, rather stout; fore- 

 legs seated some way in advance of the fore hinder legs : abdomen 

 rounded behind. On the Birch. Length of the body f line. 



England. 



316. Aphis diphaga. 



Aptera. Parva, ovata, convexa, obscurS Jlava, viridi varia; an- 

 tennee Jlavce, apice nigrce, corpore paullb longiores ; cornicula 

 viridia, corporis quadrante vix breviores ; pedes longi, Jlavi, 

 tibiis apice tarsisque nigris. 



Alata. Nigra vel nigro-fusca, niiens, linearis^ pedes fiavi ; femorihus 

 tibiisque apice tarsisque nigris ; alee limpidce. 



The viviparous ivingless female. Small, oval, convex, smooth, 

 not shining, pale yellow, and mottled with green : feelers pale yel- 

 low with black tips, a little longer than the body : mouth pale yel- 

 low with a black tip: nectaries dark green, about one-fourth of the 

 length of the body : legs long, pale yellow ; feet and tips of the 

 shanks black. 



